Chuck



(No Model.)

L. E. WIHTON.

CHUCK.

Patented Mer. 4, 1890.

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UNITED STATES PATENT OEEICE.

LUCIUS E. VHITON, OF NEW LONDON, CONNECTICUT.

CHUCK.

SPECIFICATION forming part of Letters Patent No. 422,480, dated March 4,1890.

Appiioaion sied July 12, 1889. sea No. 317,315. (No model.)

To @ZZ 1,077,071@ t mayconcern:

Be it known that I, LUGIUS E. WHITON,a citizen of the United States,residing in the city and county of New London and State of Connecticut,have invented acertain new and useful Improvement in Chucks, whichimprovement is fully Vset forth and described in the followingspecification, reference being had to the annexed sheet of drawings, inwhich* l Figure'l is a front face view of a chuck embodying my saidimprovement, a portion of the case being broken away to expose thescroll that actuates the jaws. Fig. 2 is a side view of a similar chuckpartially cut away to better illustrate my method of retaining thepinions in place in the chuck-case. Fig. 3 is a longitudinal sectionalview on line fr of Fig. l, and Fig. i is arear face view of the chuckillustrated in 'the preceding figures. Fig. 5 is a plan View of theinner face of section c; and Figs. 6 and 7 show sections of thechuclccase with a single pinion seated therein, illustrating certainmodifications hereinafter explained in detail. j

My present invention is especially applicable to that class of chucks inwhich a series of holding-jaws are supported in radial guideways andactuated by a scroll or helix on a revoluble section located within thechuckcase.

The purpose of my present invention is to simplify and cheapen somewhatthe manner of supporting and securing said piiiiomgears. Various meanshave been utilized for holding said pinions in place; but some, if notall, of said means have been objectionable, in that they have beenexpensive to produce or difficult to assemble when so produced.

My present invention is believed to overcome the existing objections ina practicable manner.

The reference-letter a in the accompanying` drawings denotes thechuck-case; b, the scrollsection rotatably seated in said case, and c acircular section introduced from thev rear side to provide both 'abacking for the scrollsection and pivotal support for the inner ends ofthe .bevel pinion-gears.

The letters d indicate the jaws of the chuck.

The case and scroll-sections and jaws, as here illustrated, aresubstantially the same as commonly used, and require no detaileddescription. At the point in case a Where the pinion-gear c is to beinserted the perimeter of said case is bored through, as plainly shownin Figs. 3, 6, and 7, and when said pinion is seated in the opening thusprovided its teeth are in operative engagement with the teeth on therear side of t-he scroll-section. The body of pinion e is' turned downto fit said opening, thus providing a long bearing; but to positivelyprevent any deflection of the inner end of said pinion I provide for ita journal-connection with the section c, above referred to. In Fig. 3such connection is attained by milling back the section c and leavingintegral studs f, over which the centrallyperforated end of the pinionmay pass when the parts are assembled.V In Fig. 6 the same result isattained by milling or turning down the inner end of the pinion toprovide a jour nal g, which may enter a corresponding hole drilled insection c.

In Fig. 7 both the pinion and section c are drilled through, andapivotal studor journal 7L is driven firmly into one of said parts, theother part being reamed slightly, in order that said journal may movefreely therein. The body of pinion e is formed with an annular groove i,preferably semicircular in cross-.section. The case a is drilled andtapped from the rear side to receive a screw m, whose body portion, whenseated in the case, is coincident with the said annular groove i. Thismeans of holding the pinion in place prevents all undue thrust movementof said pinion, yet permits it to rotate freely in its seat. Said screwalso forms the locking-key to the entire chuck. lVhe-n it is desired totake apart the chuck, said screw is iirst removed, when the pinion maybe withdrawn from its seat. This allows the removal of section c and ofthe,

scroll-section, and when these parts are removed the jaws may be drawnout of their respective ways.

The form of the finished pinion and the construction of the case toreceive said pinion require no special tools or difficult manipulationto produce; yet the complete chuck embodying the described constructionis as strong and serviceable as if made under any of the various plansheretofore employed.

Having described my invention, I claiml. In a chuck of the classreferred to, in combination with the scroll-section, a pinion engagingtherewith having a straight bodysection with annulargroove, as setforth, and a screw seated in the chuck-case coincident with said annulargroove, substantially as and for the purpose specified.

2. In combination with the scroll-section, a pinion engaging therewithhaving its inner end journaled substantially as setforth and its bodyportion grooved annnlarly, and a screw seated in the chuclecasecoincident LUCIUS E. VIII'ION.

YVitne-sscs: Y

FRANK Il. ALLEN, ALoNzo M. LUTHER.

